The school communication Control Center shall be a
Bogen Model SI35A, or approved equivalent. The
Control Center shall be engineered for optimum sim-
plicity of operation, made possible by the use of func-
tion-identified push buttons with associated color-
coded guidelines, and supported by step-by-step
instructions printed on the front panel.
Communication Control Centers, which are difficult
to operate and do not provide push-button opera-
tion, color-coded guidelines, and operating instruc-
tions permanently printed on the panels shall not be
considered. The Control Center shall provide at least
the following features and functions:
1. Direct two-way voice communication between
the Control Center and any classroom or speak-
er-equipped location, with simultaneous distribu-
tion of program material or voice announce-
ments to any other classroom or location.
2. Distribution of voice announcements from the
Control Center to any or all speakers.
3. Facilities for automatically sounding a superviso-
ry tone signal over any loudspeaker selected for
two-way communication, to alert the teacher to
the call, and to prevent unauthorized monitoring.
The tone signal shall sound whenever the class-
room is being monitored and shall repeat at reg-
ular intervals.
4. Distribution of program material to any or all
classrooms.
5. Ability to transmit a program or announcement
simultaneously to all classrooms by simple oper-
ation of a program source push button and the
All Rooms push button.
6. Separate inputs for two low-impedance balanced
microphones and one high-impedance auxiliary
program source (CD player/tuner, etc.). Program
source selection shall be accomplished by simply
pressing the appropriately labeled push button.
7. Aural and visual monitoring of all program material.
8. Facilities for voice call origination to the Control
Center from any classroom equipped with a
voice call origination switch.
9. Facilities for annunciator call-in to the Control
Center from any classroom equipped with a call
origination switch. (Note: Specify Bogen CA10A
Call Switch for this feature.)
10. Facilities to positively prevent the Control
Center from monitoring any classroom whose
call origination switch is in the Privacy position.
(Note: Specify Bogen CA11A Call/Privacy Switch
for this feature.)
11. Provision for the instantaneous distribution of
emergency messages from the Control Center to
all locations equipped with loudspeakers, simply
by pressing a single, red push button. This action
shall override all other programs and bypass all
other controls. The emergency message shall be
transmitted at a predetermined level.
12. Provision for an optional emergency page feature
which shall permit emergency announcements
from a remote telephone or microphone to all
locations equipped with loudspeakers.
13. Classroom call origination with light annunciation
and tone signal at the Control Center. Call origi-
nation shall require only a momentary depression
of the call-origination switch, which shall activate
a repetitive tone signal and light the annunciator
lamp associated with the calling classroom. The
annunciator lamp shall remain lit until the call is
answered and then be automatically cancelled.
14. Provision to optionally distribute a classroom
change signal to all speaker-equipped stations.
15. Functionally-identified push buttons and color-
coded guidelines for each function of the Control
Center. The intercom channel shall be identified
by green guidelines. The program channel shall be
identified by amber guidelines. The emergency
page push button shall be red.
16. Provision to include an optional CD player-
AM/FM tuner. (Note: Specify Bogen Model
CDR1.)
To fulfill the above requirements, a Bogen Model
SI35A, or approved equivalent Control Center shall
be used, meeting the following technical require-
ments:
It shall be designed for continuous duty service in
institutional and industrial applications on line volt-
ages of 120 volts, 60 Hz AC, over a temperature range
of 0°F to 130°F. Power consumption of the MCP35A
control panel, at rated output, shall not exceed 100
watts.
It shall include two separate amplifiers. The program
amplifier shall be capable of producing 35 watts RMS
at less than 1% distortion at rated power and band-
width. The frequency response shall be within +1,
-3 dB from 80 Hz to 15 kHz. The intercom amplifier
shall have an output rating of 20 watts RMS; frequen-
cy response shall be shaped for maximum intelligibili-
ty. Both amplifiers shall have a balanced 25-volt line
output.
It shall include inputs for two Lo-Z balanced micro-
phones, one Hi-Z unbalanced AUX input, telephone
paging accessories, and booster amplifier. Terminals
shall be provided for the time signalling and telco page
(activation) features.
Architect
and Engineer
Specifications
